Hello,

One common area to check is the vacuum elbow on the end of the intake (by the P/S pump). Some models have this, but the later models eliminated it and moved the hose to the throttle end of the intake. Make sure that the elbow is connected and intact. The hose itself runs from the intake to the PCV nipple in the fresh air hose (right near the turbo inlet). This hose can also coke up internally, leading to vacuum loss to the PCV system. Worst case scenario is to replace the entire PCV system (FCPGroton has the whole setup for $120 or so, depending on the year). Best case, you may have had ice in the PCV system (you mentioned very cold weather). This could explain the sudden onset of this problem also. Later models ('99 and up) have a heated PCV system to prevent icing, which proves that it can be a problem. Anyway, feel free to ask if there is anything else I can do.

Joe S.

2000 S70 AWD, 1995 850 Turbo, 1981 242 Turbo w/intercooler

Hi, I guess the 200kkm is when you normally start having this PCV problem emerging. In my 850/94 N/A in addition to the oilseparator tubes also the plastic vacum distribtution tower needed drilling open the small outlets, one of them going down to the flame trap.
Since I measure once a year the pressure via oil dip stick inlet with a MPX4250 pressure sensor and DVM showing less than 5% pressure changes during drive.
Br Tapsa

One thing more to check is where the tubes from the oil separator go to the turbo input. It is possible there is a blockage on the corrugated input pipe where all the smaller tubes enter, especially the tube from the oil seperator. Son-in-law discovered it on his S 70 and recently I was redoing a head and vent system and checked. This area was nearly blocked.

Anyway, check it out before you blow a rear main seal.

dick